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Transformer automatic phase-selection control method

A technology of phase selection control and transformer, which is applied in the direction of converting AC power input to AC power output, conversion equipment that can be converted to DC without intermediate conversion, and output power conversion device, etc. It can solve the problem of transformer cut-off overvoltage and excitation inrush current Interference and other problems, to achieve the effect of suppressing inrush current, protecting safe operation and improving power supply quality

Active Publication Date: 2015-10-28
ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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AI Technical Summary

Problems solved by technology

[0009] The present invention provides a transformer automatic phase selection control method to solve the existing technical problems that the current transformer generates cut-off overvoltage and excitation inrush current causes interference during the closing process.

Method used

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  • Transformer automatic phase-selection control method
  • Transformer automatic phase-selection control method

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Embodiment approach

[0074] As a preferred implementation, the non-detection residual magnetism control strategy is: control any phase to switch on when its magnetic flux is zero, and control the remaining two phases to switch on after a quarter of the power frequency period.

[0075] Figure 7 Shown is the relationship diagram of the three-phase magnetic flux when the A phase is put into operation first when the residual magnetism is not considered. In the figure, phase A closes when the magnetic flux is zero, that is, it is at the peak value of phase A voltage. In the iron cores of phase B and phase C, a magnetic flux with a phase lag of phase A of 180° and an amplitude half of it will be induced.

[0076] After phase A is selected and closed for 1 / 4 of the power frequency cycle, the dynamic magnetic flux generated in the two phases B and C is equal to the pre-induced magnetic flux generated by the two phases when they are closed at this phase. At this moment, the two phases The best phase sel...

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Abstract

The invention discloses a transformer automatic phase-selection control method. The method comprises steps of: detecting voltage signals and current signals of a power grid in real time, and carrying out voltage zero point and reference current zero point extraction; receiving an action instruction for driving a transformer to act, and detecting whether the action instruction is a closing instruction or an opening instruction; according to the action instruction, detecting the on-off state of a circuit breaker contact for controlling the closing and opening of the transformer and the detecting voltage value of an energy storage capacitor for driving a circuit breaker, and judging whether the action requirements are met; if yes, executing the closing / opening operation; and if not, executing fault processing operation. According to the invention, the phase-selection automatic switching technology is used to control the transformer to complete the closing or opening operation at an optimum phase, so that shock-free smooth transition is realized in the transformer switching process.

Description

technical field [0001] The invention relates to the field of electric power transmission control, in particular to an automatic phase selection control method for a transformer. Background technique [0002] The power grid is a dynamic system, and the change of supply and demand and power balance require that each part of the grid can be switched on or off reliably and in a timely manner. The operational performance of switches is crucial to the safe, stable and economical operation of power grids. It is applied to switching capacitive loads (capacitor banks, no-load transmission lines, etc.) The electrical system generates various disturbances, causing overvoltage and overcurrent, and even spread to the remote end to affect other users. [0003] The power transformer is one of the most widely used and most important power equipment in the power system. It plays a very important role in the links of power generation, transmission and transformation. Its stable operation de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P13/00
Inventor 徐许锋梁国坚谢幸生
Owner ZHONGSHAN POWER SUPPLY BUREAU OF GUANGDONG POWER GRID
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